Questions

Hyderabad (Telangana) is situated on the banks of river Musi.Musi Riveris a tributary of the Krishna River in the Deccan Plateau flowing throughTelanganastate in India.Hyderabadstands on thebanks of Musi river, which divides the historic old city and the new city. HimayatSagar and Osman Sagar are dams built on it which used to act as a source of water for Hyderabad.

The International Day for Biological Diversity (IDB) is observed every year on May 22 to increase understanding and awareness of biodiversity issues. The 2017 theme “Biodiversity and Sustainable Tourism” provides an opportunity to raise awareness and action towards the important contribution of sustainable tourism both to economic growth and to the conservation and sustainable use of biodiversity.

Ashwani Lohani is IRSME officer, appointed as new Chairman of the Indian Railway Board soon after A.K. Mittal stepped down from the post. He is former Chairman & Managing Director of Air India.

Let the two digits be x & y

From given data in the question, we get

x + y = 3(x - y)

x + y = 3x - 3y

=> 2x = 4y

x/y = 2/1

For having the 2:1, numbers satisfying are

12, 21, 24, 42, 36, 63, 48, 84

From this 36 is eleminated because it is a perfect square and no others are prime or perfect squares.

Hence, there exists 7 such 2-digit numbers => 12, 21, 24, 42, 63, 48, 84.

Cache Memory is scratch pad of computer.